Technique for damping oscillations in a drill string
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United States of America Patent
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Aug 21, 1984
Issued Date -
N/A
app pub date -
Sep 8, 1980
filing date -
Jul 16, 1979
priority date (Note) -
Expired
status (Latency Note)
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Abstract
There is disclosed a shock sub for incorporation in the lower part of a drill string for damping oscillations of the bit and drill string during drilling. The shock sub incorporates a spring assembly including a multiplicity of substantially annular ring springs that exhibit a spring rate of less than about 25,000 pounds per inch of deflection.
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